Henry e



(No Model.)

H. E. WAITE.

TELEPHONE. No. 310,751. Patented Jan. 13,1885.

Urirrn n Srn'rns Parana i rro HENRY E. lVAITE, OF NEWV YORK, N. Y., ASSIGNOR TO CHARLES F. LIVERMORE, TRUSTEE, OF SAME PLACE.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 310,751, dated January 13, 1885.

(No model.)

To aZZ whom it 11mg concern:

xof New York, have invented certain new and useful Improvements in Telephones, of which the following is a specification.

My invention relates to magneto-telephones, and has for its object to render such instruments more delicate and sensitive to soundvibrations, and to improve the construction of the instrument; and to these ends it consists in a telephone made as hereinafter set forth.

To one end of a suitable case is secured a mouth-piece of the usual construction, between which and the end of the case is held in a suitable manner a diaphragm of wood, brass, or any non-magnetic material. Inside the case is placed a hollow magnet, and upon the end of the same farthest from the diaphragm is placed a coil or helix of insulated wire, the ends of which are connectedto binding-posts secured in any desired manner and position to the case. Between the end of the case and the end of the magnet upon which the helix is placed is secured a spring-armature, one end of which is properly fastened to the side of the case embracing the magnet, the opposite end extending in front of the magnet. Through the hollow magnet extends a rod of hard rubber, brass, or other nonmagnetic material, one end of which is secured to the diaphragm, and the other is attached to the spring-armature at or near its free end, suitable means for adjusting the same being provided when necessary.

The accompanying drawing is a sectional View of an ordinary form of magneto-receiver embodying my invention, to which reference is made for a more particular description.

The caseA may be of any suitable material and construction, preferably hollowed out or recessed at the end, and having flanges, to which a mouth-piece, B, is secured. A diaphragm, D, preferably of non-magnetic material--such as wood or brass-is secured between the end of the case and mouth-piece, and a cap, 0, closes the other end of the case. Inside the case is placed a hollow magnet, E,

and upon the end of the magnet farthest from the diaphragm is placed a coil or helix, l of fine insulated wire, the ends of which are re spectively joined to the binding-posts l 2. Secured to the side of the case by any suitable means is a spring-plate, G, of any magnetic material, the free end of which projects before the end of the magnet E, upon which is the coil, and acts as an armature therefor. Passing through the hollow magnet, and secured at one end to the diaphragm D,;is a rod or bar, H, of some non-magnetic, and preferably non-resonant, material, the other end of which is properly secured to the spring-an mature.

The operation of the instrument is apparent from the above description. When used as a transmitter, sound-vibrations impinging upon the diaphragm producevibrations which, by means of the rod or bar passing through the hollow magnet, operate the spring-armature in front of the pole of the magnet carrying the helix, and thereby produce variations in the line current corresponding to the sound-vibrations; and when the instrument is used as a receiver, which is the preferred use, the variations in the line-current passing through the helix operate upon the springarmature, which, by means of the bar connected therewith, produce vibrations in the diaphragm in accordance with the variations in the line-current.

I have shown my invention as embodied in a telephone of the usual form, known as the Bell Receiver, but it is apparent that it may be embodied in many forms without departing from the spirit of the invention, and many changes in the unessential details may also be made.

That I claim as my invention is l. The combination, in a telephone, of a diaphragm, a magnet having a coil or helix upon the end farthest from the diaphragm, an armature adapted to vibrate before the coil or helix, and means for connecting the diaphragm and armature, substantially as set forth.

2. The combination, in a telephone, of a diaphragm, a tubular magnet extending at an angle to the diaphragm, and a coil or helix upon the end of the magnet farthest from the diaphragm, an armature adapted to vibrate before the coil,and a bar or rod passing through the magnet and connecting the diaphragm and In testimony whereof I have signed my armature, substantially as described. name to this specification in the presence of 3. -A magneto-telephone consisting of a suittwo subscribing Witnesses.

able case containing a hollow-bar magnet hav- 5 ing a non-magnetic diaphragm located at or HENRY E. WAITE.

near one end, and a helix upon the other or opposite end, a spring-armature, and a bar or Witnesses: v rod of non-magnetic material connecting the WM. H. VOODHULL, diaphragm and springarmature, siibstantially O. SPARMON.

IO as described. 

